Petrogenesis of mafic dykes and high-Mg adakitic enclaves in the Late Mesozoic Fangshan low-Mg adakitic pluton, North China Craton

Xu, Haijin; Song, Yanru; Yang, Kai; Zhang, Junfeng; Wang, Hongrong

doi:10.1016/j.jseaes.2012.04.008

Cited by 22 publications

(13 citation statements)

References 66 publications

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“…, Xu et al . ). On the basis of the size and abundance of K‐feldspar phenocrysts, the granodiorite of the Fangshan pluton has been divided into three texturally different zones, comprising a central mega‐porphyritic granodiorite, a transitional porphyritic granodiorite, and a marginal medium‐grained granodiorite (Yan et al .…”

Section: Resultsmentioning

confidence: 97%

“…, Xu et al . ). Apatite and titanite from the enclaves and host granodiorite yield similar U–Pb ages as the zircons, indicating rapid cooling of the pluton (Sun et al .…”

Section: Resultsmentioning

confidence: 97%

“…); (b) the absence of inherited zircons and the indistinguishable zircon U‐Pb ages between the MMEs and the host granodiorite (Xu et al . ). For the magma mixing model, the MMEs were considered as the ‘mafic mantle derived material’, but are not as radiogenic as the materials from the margin of the pluton or the quartz monzodiorite (Figure d).…”

Section: Resultsmentioning

confidence: 97%

“…The Fangshan granitoid pluton is lithologically dominated by medium to coarse-grained, locally porphyritic, granodiorite surrounded by minor amounts of quartz monzodiorite, both containing abundant mafic MMEs (Cai et al 2005, Sang et al 2006, Sun et al 2010, Yan et al 2011, Xu et al 2012, Zhang et al 2013. Recent This study Paul et al (2005) Kent (2008) Souders and Sylvester (2008) This study Paul et al (2005) Kent (2008) Souders and Sylvester (2008) This study Paul et al (2005) Kent (2008) Souders and Sylvester (2008) zircon U-Pb dating indicates that this pluton formed as a result of two distinct magmatic pulses at ca.…”

Section: Analysis Of the Silicate Reference Glassesmentioning

confidence: 99%

“…Recent This study Paul et al (2005) Kent (2008) Souders and Sylvester (2008) This study Paul et al (2005) Kent (2008) Souders and Sylvester (2008) This study Paul et al (2005) Kent (2008) Souders and Sylvester (2008) zircon U-Pb dating indicates that this pluton formed as a result of two distinct magmatic pulses at ca. 136-134 Ma and 131-129 Ma (Yan et al 2011, Xu et al 2012. On the basis of the size and abundance of K-feldspar phenocrysts, the granodiorite of the Fangshan pluton has been divided into three texturally different zones, comprising a central mega-porphyritic granodiorite, a transitional porphyritic granodiorite, and a marginal medium-grained granodiorite (Yan et al 2011, Xu et al 2012.…”

Section: Analysis Of the Silicate Reference Glassesmentioning

confidence: 99%

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Improved Inter‐calibration of Faraday Cup and Ion Counting for In Situ Pb Isotope Measurements Using LA‐MC‐ICP‐MS: Application to the Study of the Origin of the Fangshan Pluton, North China

Wen

Yang

et al. 2015

Geostandard Geoanalytic Res

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A laser ablation multi-collector inductively coupled plasma-mass spectrometry (LA-MC-ICP-MS) method was developed to obtain precise and accurate Pb isotopic ratio measurements in low-Pb materials (< 10 lg g -1 ) using a combination of Faraday cups and ion counters (FC-IC). The low abundance 204 Pb (~1.4%) was collected using an IC. A NBS 981 standard solution was used to cross-calculate the FC-IC gain and to investigate the signal response characteristics of the IC. A significant, continuous and linear decrease in the FC-IC gain was observed within 1 hr, but this drift could be corrected using the calibrator-sample-calibrator bracketing method. In addition, a non-linear response of the IC used in this study was observed and corrected by a non-linear correction algorithm, which was established by measuring a series of gravimetrically prepared NBS 981 standard solutions (NIST SRM 981). Compared with the conventional arrangement, the use of the newly designed X skimmer cone and Jet sample cone improved the signal intensities from Pb isotopes by a factor of 1.9. Compared with only Faraday cups, using a combination FC-IC array was found to enhance the measurement repeatability (RSD) of 20x Pb/ 204 Pb by approximately one order of magnitude when the 204 Pb intensity was < 8 mV. Eight natural glasses and the NIST SRM 612 reference material glass (as a calibration material) were measured to evaluate the new protocol for Pb isotope determination. The analytical results were in agreement with the reference values within 2s measurement uncertainties. For MPI-DING ATHO-G (5.67 lg g -1 total Pb), KL2-G (2.07 lg g -1 total Pb) and ML3B-G (1.38 lg g -1 total Pb), the typical accuracies of 20x Pb/ 204 Pb were 0.09% of preferred values with precisions of < 0.33% (2RSD). The Pb isotope ratios in feldspars from granodiorite and Une m ethode par ablation laser coupl ee a un spectrom etre de masse a source plasma et multi-collection (LA-MC-ICP-MS) a et e d evelopp e pour obtenir des rapports isotopiques du Pb pr ecis et exacts dans les mat eriaux a faible teneur en Pb (<10 lg g -1 ) en utilisant une combinaison cages de Faraday et compteurs d'ions. L'isotope en faible abondance 204 Pb (~1,4%) a et e recueilli en utilisant un compteur d'ions. Une solution standard NBS 981 a et e utilis ee pour le calcul crois e du gain cage de Faraday/compteur d'ions (FC-IC) et pour etudier la r eponse du signal caract eristique du compteur d'ions. Une diminution significative, continue et lin eaire du gain FC-IC a et e observ ee en moins d'une heure, mais cette d erive peutêtre corrig ee en utilisant la m ethode de l'encadrement de l' echantillon par des standards. En outre, une r eponse non-lin eaire du compteur d'ions utilis e dans cette etude a et e observ ee et corrig ee par un algorithme de correction non-lin eaire, qui a et e etablie en mesurant une s erie de solutionsetalons NBS 981 pr epar ee par gravim etrie (NIST SRM 981). Par rapport a la disposition classique, l'utilisation d'une nouvelle configuration avec un cône « skimmer X » et un côn...

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Section: Resultsmentioning

confidence: 97%

“…, Xu et al . ). Apatite and titanite from the enclaves and host granodiorite yield similar U–Pb ages as the zircons, indicating rapid cooling of the pluton (Sun et al .…”

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Section: Analysis Of the Silicate Reference Glassesmentioning

confidence: 99%

Section: Analysis Of the Silicate Reference Glassesmentioning

confidence: 99%

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Improved Inter‐calibration of Faraday Cup and Ion Counting for In Situ Pb Isotope Measurements Using LA‐MC‐ICP‐MS: Application to the Study of the Origin of the Fangshan Pluton, North China

Wen

Yang

et al. 2015

Geostandard Geoanalytic Res

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Assimilation of the mafic‐ultramafic magma: A case study of diabase dyke at the Beidaihe, North China Craton

Wang

et al. 2019

Geological Journal

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Assimilation serves as a significant part during magma's evolution. Because of rapid cooling of mafic-ultramafic magma, assimilation between mantle-derived magma and crustal rocks (wall rocks) is often neglected. The Beidaihe diabase dyke in North China Craton suggests that assimilation of the rapidly cooled mantle-derived magma cannot be ignored. The diabase dyke is very thin (~1 m in width) with chilled margin.The dyke centre is porphyritic texture while the chilled margin is aphanitic texture, suggesting a rapid crystallization process. From the centre to margin of the dyke, contents of SiO 2 (from 48.12-49.94 wt.% to 38.29-46.63 wt.%), MgO (from 7.46-9.17 wt.% to 3.39-4.71 wt.%), Ni (from 91.5-118 ppm to 6.5-45.8 ppm), and Cr (from 243-306 ppm to 1.7-80.5 ppm) are obviously decreased, but contents of Fe 2 O 3 T (from 8.71-9.39 wt.% to 9.21-12.30 wt.%), CaO (from 5.67-7.08 wt.% to 6.91-10.26 wt.%), and CO 2 (from 0.25-1.92 wt.% to 4.52-6.58 wt.%) are distinctly increased. The dyke intruded discordantly into Ordovician limestone. Limestone far away from the dyke mainly consists of micro calcites with low MgO (0.55-0.77 wt.%) and FeO (0.07-0.09 wt.%) but high CaO (53.82-55.51 wt.%) and CO 2 (44.46-45.02 wt.%) contents. Limestone close to the dyke metamorphosed into marble, which mainly comprises of recrystallized calcite/dolomite and diopside, with high MgO (1.85-2.35 wt.%) and FeO (0.17-1.36 wt.%) but relatively low wt.%) and CO 2 (38.77-41.04 wt.%). All these suggest an assimilation process of the mantle-derived magma with wall rocks limestone. Based on the chemical balance at the interface between the diabase and limestone, CO 2 exchange model is used to estimate the degree of assimilation. The calculated assimilation degree is about 8-12% at the dyke margin. There is obvious elements exchange between magma and wall rocks, and the transfer ability of Mg is greater than that of Ca. Meanwhile, Fe oxides quickly precipitated at the margins of the dyke for the increase of f O 2. Therefore, even for mantle-derived magma which chilled rapidly, it may also be obviously influenced by assimilation, especially when wall rocks are carbonate sediments. Simultaneously, this study provides a possible explanation for some mantlederived rocks in carbonate areas with high LOI.

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Petrogenesis and geodynamic significance of Late Triassic mafic microgranular enclaves and its host granodiorite in the Shuanghu area, central Qiangtang

Xie

Huang

et al. 2022

Geological Journal

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The genesis of Late Triassic granitoids in the central Qiangtang is significant for deducing the evolution of the Palaeo‐Tethys Ocean in Qiangtang Block. Herein, we present a comprehensive study of zircon U–Pb ages, whole‐rock geochemistry and zircon Lu–Hf isotopes for the mafic microgranular enclaves (MMEs) and host granodiorites from the Shuanghu area, in order to evaluate their petrogenesis and geodynamic implications. New zircon U–Pb dating show identical formation ages for host granodiorites (207.1 ± 2.2 Ma and 206.6 ± 3.8 Ma) and MMEs (205.4 ± 2.9 Ma and 209.2 ± 2.2 Ma). The Shuanghu granodiorites contain amphibole and biotite and are characterized by moderate SiO2 (64.74–66.40 wt%) and K2O contents (2.48–3.62 wt%) as well as low A/CNK (0.69–1.00), indicating I‐type granite affinity. Its enriched zircon Hf isotopes (εHf(t) = −12.04 to −5.09) indicate that they were derived from the ancient mafic lower crust. The MMEs have a similar mineral assemblage, emplacement ages, trace elemental and zircon Hf isotopic compositions with the host granodiorites, indicating the cognate origin. These MMEs represent autoliths captured by latter ascending host magmas in the middle‐upper magma chamber. The highly variable Mg# (37–53), Cr (16.9–190 ppm) and Ni (5.71–67.2 ppm) in the Shuanghu MMEs and host granodiorites indicate that the mantle‐derived magma provided not only the heat but also the mafic components. In combining with previous studies, we suggest that the Shuanghu granodiorites and MMEs were formed in the post‐collision stage, which were caused by the asthenosphere upwelling related to the slab breakoff.

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Petrogenesis of mafic dykes and high-Mg adakitic enclaves in the Late Mesozoic Fangshan low-Mg adakitic pluton, North China Craton

Cited by 22 publications

References 66 publications

Improved Inter‐calibration of Faraday Cup and Ion Counting for In Situ Pb Isotope Measurements Using LA‐MC‐ICP‐MS: Application to the Study of the Origin of the Fangshan Pluton, North China

Improved Inter‐calibration of Faraday Cup and Ion Counting for In Situ Pb Isotope Measurements Using LA‐MC‐ICP‐MS: Application to the Study of the Origin of the Fangshan Pluton, North China

Assimilation of the mafic‐ultramafic magma: A case study of diabase dyke at the Beidaihe, North China Craton

Petrogenesis and geodynamic significance of Late Triassic mafic microgranular enclaves and its host granodiorite in the Shuanghu area, central Qiangtang

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